Paper machine



SePt 8 193 w. GIEBELER 1,822,023

PAPER MACHINE Filed May 24. 1930 y i "a Patented iSept. 8, 1931 l UNITED STATES PATENT OFFICE WILHELM GIEBELER, OF KONIGSTEIN-ON-THE-ELBE, V(}E.R1VIIA1\`I'Y PAPER MACHINE Application filed May 24, 1939, Serial No. 455,305, and in Germany September 21, 1926.

'i My invention relates to paper machines In the drawings havlng movable Fourdrinler wires and slices Fig. l 1s a diagrammatic elevation of the at the front end of the machine. machine,

It is an object of my invention to eliminate Fig. 2 is a section on the line II-II in 6 certain drawbacks of machines of this type Fig. l, and 55 as designed heretofore. To this end in addi- Fig. 8 is a plan view of Fig. 2.

tion to the means for removing the water Referring now to the drawings, and first from the pulp by back-pressure at the point to Fig. 1, only those parts of the machine where the slices are arranged, I provide furhave been illustrated diagrammatically 10 ther means for the same purpose which eX- which are important for the understanding 60 tend along the F ourdrinier wire as far as ofthe invention. c is the breast roll, lis the the water in the pulp still permits a variation couch roll, (l is the Fourdrinier wire which in the position of the fibres. is supported on, and actuated by, the cylin-r In paper machines of the type referred to ders, m, m are guide and table rolls for the 15.as designed heretofore the -felting of the upper and lower reaches of the Fourdrinier 65V paper fibres is often unsatisfactory between, wire (l, and n, n are'guide rolls supporting and immediately at the rear of, the slices therusual beltsuwhich move in parallel with because a considerable percentage of the fibres the upper reach of the F ourdrinier wire.

assumes a position parallel to the direction a are the slices, three of which are shown in which the Fourdrinier wire is moved, by way ofv example, b is the first water trough 70 under the influence of the, flow beneath the below the slices, and c, c are supplementary last slice. The fibres tend to remain in this troughs which extend throughout the danger parallel position and only comparatively few zone below the Fourdrinier wire d. fibres assume a transverse position. It has Referring now to Figs. 2 and 3, p are mem- '25 already been suggested to eliminate this bers of the frame of the machine which ex-v 75 drawback by effecting hydraulic back-prestend along the Fourdrinier wire d, are guidsure in the space intermediate and immeing blocks on the frame, g, g are pm s secured diately at the rear of, the slices so as to preto the ends of the troughs and adapted to vent removing of the water at this station. slide in the blocks h for shaking the Four- A water trough was provided below the drinier wire d, and t, t are straps at the ends B0 Fourdrinier wire in the vicinity of the slices. extending from the ends of each trough and By these means the fibres are held suspended supported on the frame members p. Means and therefore have no tendency to assume ar are provided for regulating the hydraulic definite position so that satisfactory felt-ing back-pressure in the troughs c, such means 5 is obtained. However, the fibres are still comprising aslide f which is guided in suit- 85 able to assume an undesirable position at the able brackets g at the bottom of each trough rear of the slices along the Fourdrinier wire. and isperforated at r. By means of a han- The danger zone extends as far as there is dle s, the slides f are adjusted so that the perstill so much water in the pulp that the fibres/"forations r and e in the slides and the troughs are not in firm engagement with each other. register/'Lto a greater or lesser extent, or are 90 By providing hydraulic back-pressure closed, as shown in Fig. 2. Means, not shown,

means throughout this zone I obtain a posimight be provided for adjusting the slides f tive control of the removing of the water. in unison but it is preferred to regulate each Preferably the region of back-pressure at trough independently as required at the point the rear of the slices is subdivided into sevwhere such .trough is situated. Inv the pres- 95 eral independent control ranges. ent instance, therefore, the danger zone is In the drawings affixed to this specificasubdivided into as many control ranges as tion and forming part thereof a machine emthcre are troughs c. bodying my invention is illustrated diagram- When the slide f in a given trough e 1s matically by way of example. moved so that the openings e in the trough 30 of the pulp. l

I wish it to be understood that I do not desire to be limited to the exact details of con-` served.

register fully witli the openings 1 inthe slide, the water owing through the Fourdrinier wire from above is discharged through the openings e, r. When, however, the openings 5 are closed more or less, an increasing resistance is opposed to the discharge of the water, and the Water rises in the trough.

When it reaches the Fourdrinier wire d, it Y begins to exert a pressure on the pulp from.

below and to interfere with the flow of the Water. The interference is' a function of the area e, r which the corresponding slide f has laid open. y i

The troughs 'are' pitched apart fora dis,

tance lwhich must be selected so as to prevent interference of the troughs with the .Walls of th adjacent troughs as theyzare being shaken. The distance z' should be as small as practicable in orderto prevent distortion of the Fourdrinier wire when the troughs are shaken. Preferably the clearance i is. only about l@ to 1/8 in.`

By means of the arrangement of supplementary troughs c at the rear of the first `trough b V below the slices a the water condistruction shown and described fo'rfobvious modifications will c'cur. to afpersn skilled in the art.

In the claims affixed to this specification no selection of any particular modification of the invention is intended to the exclusion of othermodifications thereof and theright to 40 subsequently make claim to any modification not covered by these claims is expressly re- I claim 1. A paper machine comprising a slicef ,I a wire adapted to be moved with respect to said slice, hydraulic back-pressure means ar.- rang'ed in the immediate vicinity of said slice,

arranged in the immediate vicinity of said l slice, and hydraulic back-pressure troughs extending from said first-mentioned trough part way to the rear along said wire. j 4. A paper machine comprising a slice, a wire adapted to be moved with respect to said slice, a hydraulic back-pressure -trough arranged in the immediate vicinity of said slice, hydraulic back-pressure troughs extending from said first-mentioned trough partway to the rearl along said Wire, and means for regulating independently the back-pressure in each of said last-mentioned troughs.

5. A paper machine comprising a slice, a wire adapted to be moved with respect to said slice, a hydraulic back-pressure trough arranged in the immediate vicinity of said slice,-

and hydraulic back-pressure troughs adapted to be shaken and extending in spaced relation to each other from said first-mentioned trough part way to the rear along said wire.

6. The method of making paper comprising subdividing a layer of pulp into a pluralityof independent regulating sections and regulating, by hydraulic back pressure, the removal of water from these sections as far as the water contents of the layerv is still so high as to permit variation of the relative position of the fibres.

In testimony whereof I affix my signature.

WILHELM GIEBELER.

hydraulic back-pressure means extending l from said first-mentioned means part way to 50 the rear along said wire, .and means for regulating the flow of water in said firstand in said second-mentioned back-pressure means. 2. A paper machine comprising a slice,

= a wire adapted to be moved with respect to 5 saidslice,` hydraulic back-pressure means arranged inthe immediate vicinity of said slice, hydraulicy back-pressure means extending f vfrom said first-mentioned means part wayto the "rear along said wire, and independent means for regulating the flow of yWater in said first-and in saidsecond-mentioned back-prese means.

' paper machine comprising a slice, wire Vadapted tobe moved with respect to .said slice-a hydraulic back-pressure trough 

